There's a placental barrier between the mother and the fetus, so not everything that's in the mother's blood can pass to the fetus. Mostly the transport happens via diffusion, so particles that can passively pass the membranes of the barrier can end up in the fetus' blood. These include most drugs and poisons as well, so in that light I'd also guess that the answer is 'yes'. Also some other stuff like viruses can get into the fetus through the barrier, though this happens more rarely (e.g. the HIV only infects some fetuses if the mother has the infection).